You'll need to use Bottle Caps to Hyper Train if you want to raise your Pokémon's IVs in Pokémon Legends: Z-A. We explain how in our guide.

Note that EV training is a more "end-game" method to make your Pokémon stronger, as many of the items and areas you'll want ...

Players who want to give their Pokemon perfect stats in Pokemon Legends: Z-A can learn about EV training, IVs, and more in this guide.